*{
    margin: 0;
    padding: 0;
}
html,body{
    width: 100%;
}
body{
    background:url(../images/beijj.jpeg) no-repeat;
    background-size: cover;
}
.box{
    width: 960px;
    margin: 50px auto;
}
.circle{
    width: 200px;
    height: 200px;
    margin-left: 10px;
    float: left;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 0 16px rgba(255, 255, 255, 0.6) inset;
}
.text{
    padding: 80px 20px 0;
    box-sizing: border-box;
    height: 200px;
    background-color: rgba(140, 65, 170, 0.6);
    border-radius: 50%;
    transform: scale(0);
}
.text h2{
    font-size: 18px;
    color: white;
    letter-spacing: 4px;
    text-align: center;
}
.text p{
    border-top: solid 1px rgba(255, 255, 255, 0.5);
    font-size: 15px;
    color: white;
    text-align: center;
    opacity: 0;
}
.spring{
    background: url(../images/chun.png) no-repeat;
    background-size: 100% auto;
}  
.circle:hover .text{
    transform: scale(1);
    transform: all 0.4s ease-in-out;
}
.circle:hover{
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.1);
    transition: all 0.2s ease-in-out;
}
.circle:hover .text p{
    opacity: 1;
    transition: all 1s ease-in-out;
}
.summer{
    background: url(../images/xia.png) no-repeat;
    background-size: 100% auto;
}
.autumn{
    background: url(../images/qiu.png) no-repeat;
    background-size: 100% auto;
}
.winter{
    background: url(../images/dong.png) no-repeat;
    background-size: 100% auto;
}
.spring:hover body{
    background: url(../images/lun4.png) no-repeat;
    background-size: cover;
}
